论文部分内容阅读
以氧化石墨烯(GO)、TiO2、尿素、NH4F和Vc为原料,采用水热法制备氟氮共掺杂二氧化钛/还原氧化石墨烯复合光催化剂(F-N-TiO2/rGO)。对制备的F-N-TiO2/rGO样品的相组成、结构、形貌和光谱性质进行分析表征。结果表明:F、N共掺杂的TiO2仍为锐钛矿晶型,呈纳米颗粒状均匀分布在片状还原氧化石墨烯表面;增强了对400~800nm可见光的吸收,且吸收边发生明显的红移;同时C—Ti共价键的形成使石墨烯与TiO2紧密结合,提高了界面电荷传输效率使光生电子有效分离,使得F-N-TiO2/rGO的催化活性大大增强,可见光下对甲基橙(MO)的降解速率达1.17mg/(h·g),是商品P25的2.8倍。
Fluorine nitrogen co-doped TiO2 / reduced graphene oxide composite photocatalyst (F-N-TiO2 / rGO) was prepared by hydrothermal method using GO, TiO2, urea, NH4F and Vc as raw materials. The phase composition, structure, morphology and spectral properties of the prepared F-N-TiO2 / rGO samples were characterized. The results show that: F, N co-doped TiO2 remains anatase crystal form, uniformly distributed in the form of nano-particles flaky graphene oxide surface; enhanced to 400 ~ 800nm visible light absorption, and the absorption side of the obvious Red shift. At the same time, the formation of C-Ti covalent bond tightly bonds graphene and TiO2, which improves the charge transfer efficiency of the interface and effectively separates the photoelectrons so that the catalytic activity of FN-TiO2 / rGO is greatly enhanced. Under visible light, (MO) degradation rate of 1.17mg / (h · g), 2.8 times the commercial P25.